Add NeuropixelsV2eBeta GUI

[bparks13]

This PR adds GUIs for the NeuropixelsV2eBeta headstage. The added dialogs are functionally similar to the NeuropixelsV2e GUIs, but use the correct underlying type (i.e., *Beta types).

Closes #227
Fixes #202

[jonnew]

As per our discussion in the meeting today, the feeling is that there must be a way to reuse the non-beta NP2.0 GUI elements instead of all this code reproduction. Perhaps by

• Defining an interface and operating on the interface
• Defining a common, intermediate base type for both headstages in the main library
• Performing a hard cast instead of testing for types (probably not great)

[bparks13]

@jonnew If I try to cast directly using var configureHeadstage = (ConfigureNeuropixelsV2eHeadstage)component;, where component is of type ConfigureNeuropixelsV2eBetaHeadstage, I get an exception.

I'll work on implementing a common interface that both headstages implement, then I can pass the interface to the existing dialog instead of copying all of this code.

For cleanliness, I'm going to convert this PR to a draft, and then close it once these new changes are implemented.

[bparks13]

This has been implemented much more efficiently in #269. This PR is no longer needed.